Ingot for press piercing and shaping arrangement therefor



1941- K. BUNGEROTH arm. I 2,268,472

INGOT FOR PRESS PIERCING AND SHAPING ARRANGEMENT THEREFOR Filed Aug. 16, 1959 INVENTORS KARL BUNGEROTH HEINRICH HEETKAMP BY THEIR ATTORNEYS Patented Dec. 30, 1941 'INGOT FOR. PRESS PIERCING AND SHAPING ARRANGEMENT THEREFOR Karl Bungeroth, Dusseldorf, and Heinrich Heetkamp, Dusseldorf-Buderich, Germany Application August 16, 1939, Serial No. 290,470 In Germany January 16, 1937 7 Claims.

The invention relates to angular section ingots for piercing in a press by the Ehrhardt method and arrangements for shaping such ingots.

For the convenient insertion and ejection of an ingot from the matrix of a piercing press the bore of the matrix is frequently coned slightly. The result of this is that an ingot of accurate prismatic shape is only guided satisfactorily towards the lower end of the matrix. To ensure that the piercing is'always central the ingot ought to be guided over its whole length by the matrix..

According to the invention an angular section ingot is used for piercing which has its longitudinal angular edges tapered. The taper of the edges is the same as that of the matrix. The taper is produced after the ingot has been severed from the bar of material coming from the roughing rolls. A further feature of the invention consists in an arrangement for shaping these ingots, for instance for producing the requisite taper. The arrangement comprises in the preferred form two trains of rolls, which may conveniently be arranged one behind the other in a common housing.

The first set of rolls has a regular polygonal pass and brings the cross-section of the ingot down to the correct dimensions at the large end and if required it may also round the edges to the desired radius. The second set of rolls has a similar polygonal pass but the grooves become smaller in depth and width in the direction of rolling to produce the taper of the ingot edges.

In the piercing of square ingots by the Ehrhardt method in a press the drawback occurs that the material at the ends of the ingot rises to form a bur as the punch enters. The burs so produced cause difiiculty in the subsequent processes. According to a further feature of the invention this is overcome by chamfering the edges 01 the ingot at the ends or at least at the end by which the piercing punch enters.

For simplicity in manufacture and so that the ingot may better fitthe sharply tapered base intended to receive it, it is preferable in practice to chamfer both ends, that is to make the ends more or less pointed. This is carried out by two upsetting tools. to which the ingot is passed before going through the rolls referred to above.

The accompanying drawing shows the combined arrangement of upsetting tools and rolls diagrammatically in elevation in three successive working positions, Fig. 1 showing the ingot in the upsetting tools before being passed to the rolls; Fig.2 showing the ingot in the rolls which reduce it to the correct dimensions of the large end; and Fig. 3 showing the ingot in the rolls which taper the ingot.

Referring to Figure 1, the heated ingot a of square section is placed between the upsettingtools I) and c for chamfering the ends by means of the female tapered recesses therein. The upsetting tool b is stationary and the upsetting tool 0 is movable longitudinally. Ejector pins d and e pass through the .apices of the recesses in the upsetting tools. The ejector pin d is connected to the movable upsetting tool c, while the ejector pin e is stationary. Below the chamfering arrangement is arranged a lifting feeder i which can be raised and lowered as required.

When the ingot has been given the desired shape'at its two ends by the converging movement of the two upsetting tools, the tool 0 is withdrawn to free the ingot. The ejector pins d and e enter the corresponding apertures of the upseting tools and place the ingot on the feeder i in such a position that it can conveniently be removed from the chamfering device.

In the example illustrated the chamfering device is arranged at a higher level than-and alongside the rolls intended for the further shaping of the ingot and its edges. This is the preferred arrangement.

The arrangement for shaping the ingot comprises two sets of rolls g and h within a common housing k. The rolls g form a square or other suitable section; they have grooves of the same.

j moves the ingot from the lowered feeder i first between the rolls of the first set 9. Here the cross-section of the ingot and any rounding of the edges are brought to the correct dimensions. In Figure 2 the ingot is just emerging from the rolls a.

By means of the pusher f the ingot is then pushed further still through the roll housings to enter the rolls h. In consequence of the shape of groove mentioned above the ingot is here given the requisite taper as may be seen from Figure 3.

The set of rolls h after the passing of the ingot is turned back to the initial position again by springs or weights or by other suitable means (not shown).

The chamfering of both 'ends of the ingot in the upsetting tools has the object of preventing the formation ofburs at the end against which the pusher f presses during the rolling and to chamfer the end to make it a better fit in the matrix during the piercing process.

The drawing shows that the chamfer at the first end is partly lost in the rolling while at the end first erably in a common housing one behind the other in the pass direction, the first set of rolls having square or other regular polygonal grooves to bring the ingot, to the correct dimensions at the large end and the second set of rolls having similar grooves but decreasing in width and depth to produce the longitudinal taper.

2. An arrangement as claimed in claim 1 in combination with a preceding arrangement for producing ingots having'chamfered edges at one or both ends.

3. An arrangement as claimed in claim 1, in combination with means for chamfering the ingot ends comprising two upsetting members with female taper adapted to approach each other with the ingot between them.

4. An arrangement as claimed in claim 1, in combination with means for chamfering the ingot ends arranged beside the rolls at a higher elevation.

5. An arrangement as claimed in claim 1, in combination with means for chamfering the ingot ends arranged beside the rolls at a higher elevation, a lifting feeder to raise the ingot to the chamfering device and lower it to the rolls and comprising a pusher to push the ingot off the feeder into and through the rolls.

6. .An arrangement as claimed in claim 1, in combination with means for chamiering the ingot ends comprising two upsetting members with female taper adapted to approach each other with the ingot between them and ejector pins entering the apices of the upsetting members.

7. An arrangement as claimed in claim 1, in combination with means for chamfering the ingot ends comprising two upsetting members with female taper adapted to approach each other with the ingot between them and ejector pins entering the apices of the upsetting members, one of said upsetting members being stationary and its associated ejector pin being attached to the other upsetting member to move therewith, while the ejector pin associated with the latter upsetting member is stationary.

KARL BUNGEROTH. HEINRICH HEETKAMP. 

